DE202016102388U1 - Field attachable contact with axial screw connection - Google Patents

Abstract

Convertible contact (1) for connecting a stranded conductor, consisting of an elongated hollow-cylindrical contact body (8) whose inner wall (9) is formed in a receiving area (A) for the stranded conductor with a clamping surface (3) which is curved in the form projecting circumferential bead (W) is formed and adapted to cooperate with clamping surfaces (11) in the contact body (8) axially movably mounted clamping body (10), wherein the clamping body (10) has a spherical end (12) which the clamping surfaces (11) trains.

Description

The invention relates to a prefabricatable contact for the clamping connection of a stranded conductor with a movably mounted in a contact body clamping body.

From the prior art a variety of ways for fastening electrical lines in a contact, connectors or contact connectors are known in which the electrical conductor is held with a releasable connection. For example, this can be found in different versions of luster terminals or banana plugs again.

The disadvantage here is the different shape of the screws and the opposite contact surfaces for fastening the electrical conductors. There is a risk that the individual wires of the conductor are sheared off at the sharp edges of the clamping surfaces. Such problems also exist in industrial connectors with axially movable sprags.

In particular, when high currents or equipotential bonding must be forwarded in a controlled manner for large cable cross-sections, there is the problem of reliably connecting such stranded conductors with a large cable cross-section.

From the EP 1 359 642 B1 a contact element with a connection for stranded conductor is known, the advantageous embodiment consists in two different shaped angles between the conical surfaces of a contact part and a clamping shoulder of a clamping sleeve.

The disadvantage of this is that when using common connections for cable connections of these orders of magnitude with cross sections of about 10 mm ² to 35 mm ² , very large squeezing forceps with long lever arms are required at endurable force to appropriate crimping between a contact part and a stranded conductor manufacture.

From the WO 2011/131179 A1 Another connector for stranded wire is known.

In this, a plug body is provided which is formed so that the plug body has a guided contact chamber in which a pressure body by means of a thread radially rotatable and thus axially displaceable, such that the pressure body has a pointed cone, which in a hollow cone the connection side of the plug body can be inserted, so that an introduced between the hollow cone and the pointed cone stranded conductor is dezierbar and that the plug body is arranged with the mounted wire conductor within the contact chamber of the plug housing radially freely rotatable. This results between the opposing clamping surfaces a substantially linearly extending receiving space with each linearly extending opposite clamping surfaces. When screwing in the clamping body for pressing the strands of the stranded conductor, the strands are, however, led out with increasing displacement of the clamp body again from the receiving space or there is a risk that the position of the strands does not remain in the desired insertion position.

It is therefore an object of the present invention to overcome said disadvantages and to provide an improved prefabricated contact for connecting a stranded conductor, in which in particular a reliable clamping and pinching of the stranded conductor takes place and the stranded conductor is further advantageously fixed in its mounting position without him when screwing the clamping body is displaced undesirable.

This object is achieved with a contact with the features of claim 1.

The basic idea of the present invention is that both the clamping body with its clamping surfaces and clamping form as well as the clamping body receiving contact body with correspondingly suitable clamping surfaces is formed so that on the one hand a good clamping is effected and on the other hand is given a self-locking during fixing by the clamping body ,

The self-locking effect according to the invention comes from the fact that the clamping body is itself formed with a substantially spherical end, which form the clamping surfaces of the clamping body. For this substantially spherical clamping body, a corresponding bead formed by the inner wall of the contact body is formed, which is formed convexly as a circumferential bead in the contact body.

According to the invention, therefore, a prefabricatable contact for connecting a stranded conductor is provided, consisting of an elongated hollow cylindrical contact body whose inner wall is formed in a receiving space for the stranded conductor with a clamping surface which is shaped as a convexly protruding in the form, circumferential bead and formed for cooperation with clamping surfaces of an axially movably mounted in the contact body clamping body, wherein the clamping body has a spherical end which forms the clamping surfaces of the clamping body.

Due to the spherical shape of the clamp body ensures that a particularly good displacement of the stranded conductor is made to the contact body side clamping surfaces.

In an advantageous embodiment of the invention it is provided that the contact body has at its one contact body end a conductor opening for introducing a stranded conductor into a receiving space between the clamping surfaces of the contact body and the clamping body.

It is further provided with advantage when the clamping body in the contact housing is axially movable, preferably mounted on a thread and a mounting position of the stranded conductor, wherein the distance between the clamping surfaces is selected so that the stripped strands of a stranded conductor in a receiving area B between the clamping surfaces can be brought into a clamping position of the stranded conductor can be screwed, wherein the distance between the clamping surfaces is reduced compared to the distance in the mounting position.

In other words, the clamping body can be transferred from a mounting position into a clamping position.

By increasing rotation and thus axial displacement of the clamp body, the stranded conductors can be brought over the spherical end of the clamp body to the corresponding inner wall surface of the contact body. Depending on the tightened torque can be achieved in this way a desired pinch of the stranded conductor between the opposing clamping surfaces.

It is further provided with advantage if a tool holder is formed in the clamping body, which is accessible via a plug-side opening in the contact carrier from the outside.

In this way, it is possible that a wrench or an Allen wrench is inserted in particular by a plug-side opening and the clamping body can be conveniently operated from its mounting position to its clamping position.

In a further advantageous embodiment of the invention, it is provided that the contact body has an inner wall section W1 with an inner radius r1, an adjoining curved wall transition section W2 with a changed inner radius and a substantially annular inner wall section W3 with an inner radius r2, wherein the radius r2 is smaller is the radius r1.

It is particularly advantageous if the wall transition section, which lies between the inner wall section W1 and the inner wall section W3, is formed as a twice curved wall transition section, which initially changes from an inward curvature to an outwardly directed curvature and opens into the annular inner wall section section W3 ,

It is also advantageous if the bead is at least partially formed by the wall transition section W2.

In a further advantageous embodiment of the invention it is provided that the wall transition section W2 is at least twice curved and preferably in a first inwardly curved course has a decreasing radius and then in a direction in the opposite direction outward curved course (with increasing radius).

It is therefore advantageously provided that the course of the inner wall along the axial direction Z or parallel to it can be described from the inner wall section W1 to the inner wall section W3 according to the function y (z), which includes a function which can be differentiated continuously over the entire course into z represents unique differential values.

This means that unlike z. B. is provided from the aforementioned known in the prior art documents that the curvature of the bead and thus the curvature of the inner wall of the contact body is shaped so that no kinks are provided or sharp edges, thus no spontaneous change in curvature exists.

It is further provided with advantage if adjoining the inner wall section W3, a further wall section W4, which has a curved outward course. This means that the wall section W4 increases in its radius toward the insertion end of the contact body.

In a further advantageous embodiment of the invention, it is provided that the spherical head of the clamping body is formed by more than one hemisphere, preferably by a three-quarter ball, preferably followed by a cylindrical shaft and more preferably on the shaft previously said Thread is mounted, in which the clamping body is mounted screwed in the contact body.

Other advantageous developments of the invention are characterized in the subclaims or will be described below together with the Description of the preferred embodiment of the invention with reference to the figures shown in more detail. Show it:

1 a known from the prior art solution of a contact element for clamping connection with a stranded conductor;

2 a first embodiment of a formable contact according to the present invention;

3 an alternative embodiment of a pair of attachable contacts according to the present invention.

In the 1 an embodiment of the prior art is shown. As the figure already shows, the contact body has sharp edges and kinks that can lead to damage of the stranded conductor. Furthermore, it is not guaranteed by the pointed design of the clamp body, at least not sufficiently ensured that the strands of the stranded conductor are sufficiently spread.

In the following, the invention is based on the 2 and 3 explained in more detail, wherein like reference numerals refer to the same functional and / or structural features.

In the 2 and 3 are embodiments of prefabricated contacts according to the invention 1 shown.

These customizable contacts 1 serve the connection of a stranded conductor, not shown. The ready-made contact 1 is made of an elongate, substantially hollow cylindrical contact body 8th formed, the inner wall 9 in a receiving area A for the stranded conductor with a clamping surface 3 is trained.

The inner wall has a curved in shape, protruding, radially encircling bead W on. The bead W forms the clamping surfaces 3 made, which is shaped so that this with the clamping surfaces 11 one in the contact carrier 8th axially movable mounted clamp body 10 can interact.

As further in the 2 and 3 recognizable, has the clamp body 10 a spherical end 12 and are the clamping surfaces 11 through the surface of the spherical end 12 shaped.

As can be seen further in the figures, the contact body has 8th at its one contact body end 8a a ladder opening 4 for inserting a stranded conductor in the receiving area B between the clamping surfaces 3 . 11 , between the inner wall of the contact body 8th and the spherical surface of the spherical end 12 of the clamp body 10 ,

Furthermore, the clamping body 10 in the contact housing 8th axially movable on a thread 13 stored. Here is the thread 13 so between the clamp body 10 and the contact housing 8th formed, that by a rotation of the clamping body 10 the clamping body depending on the direction of rotation in the axial direction Z or against the axial direction Z with respect to the contact housing 8th is displaced axially.

In this way, the clamping body 10 from a mounting position of the stranded conductor, wherein the distance between the clamping surfaces 3 . 11 is chosen so that the stripped strands of a stranded conductor in the receiving area B between the clamping surfaces 3 . 11 can be brought into a clamping position, wherein the distance between the clamping surfaces 3 . 11 is reduced relative to the distance of these clamping surfaces in the mounting position.

Depending on the cable cross-section and number of strands, which was guided in the receiving area B between the clamping surfaces, it is necessary to apply with appropriate tool a sufficiently high clamping force to a particularly good fixation of the strands in the contact body 8th sure.

For this purpose, a tool holder is advantageous 6 in the clamp body 10 formed, which via a plug-side opening 14 in the contact body 8th by means of a tool from the outside is accessible.

The contact body 8th has in the embodiments shown several inner wall sections W1 to W4, which are described in more detail below.

The Indian 2 shown inner wall portion W1 represents a substantially cylindrical annular inner wall portion having an inner radius r1. Adjacent to this inner wall portion r1 is a curved and doubly curved wall transition section W2. An annular inner wall section W3, which has an inner radius r2, in turn adjoins the wall transition section W2.

The inner radius r2 is smaller than the aforementioned radius r1 of the inner wall portion W1.

It can be seen that the bead W is at least partially formed by the wall transition section W2. Especially in the area of the wall transition section W2, the clamping takes place between the spherical end 12 of the clamp body 10 and the clamping surfaces 3 the bead W.

As previously mentioned, the wall transition section W2 is doubly curved and initially curves inward starting from the inner wall section W1, and then laterally curves in the opposite direction outwards and opens into the aforementioned inner wall section W3.

The course of the inner wall can therefore be described by means of a function y of z, where y in each case the radial distance between a vertical through the center of the contact 1 extending axis z and the inner wall of the contact body 8th Are defined.

Z defines a position along the axial direction or the axis z.

In this respect, the course of the inner wall according to the function y (z) follows such that it is continuously differentiable over z over the entire course.

As further seen in the figures, adjoins the inner wall portion W3, a further wall portion W4, which is a kind of tulip-shaped opening to the insertion end of the contact body 8th formed.

It is further in the embodiments of 2 and 3 recognizable that the head of the clamp body is formed by more than one hemisphere, preferably by a three-quarter ball, which is attached to a cylindrical shaft 17 followed.

The invention is not limited in its execution to the above-mentioned preferred embodiments. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.

LIST OF REFERENCE NUMBERS

1

Contact

3

clamping surface

4

conductor opening

6

tool holder

8th

Contact Body / contact housing

8a

Contact body end

9

inner wall

10

clamping bodies

11

clamping surfaces

12

The End

13

thread

14

opening

17

shaft

A

reception area

B

reception area

r1

inner radius

r2

inner radius

W

bead

W1

Inner wall section

W2

Wall transition section

W3

Inner wall section

W4

wall section

y

distance

Z

axially

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1359642 B1 [0005]
• WO 2011/131179 A1 [0007]

Claims (10)

Field attachable contact ( 1 ) for connecting a stranded conductor, consisting of an elongate hollow cylindrical contact body ( 8th ), whose inner wall ( 9 ) in a receiving region (A) for the stranded conductor with a clamping surface ( 3 ), which is formed as a curved in the form of projecting circumferential bead (W) and adapted to cooperate with clamping surfaces ( 11 ) one in the contact body ( 8th ) axially movable mounted clamping body ( 10 ), wherein the clamping body ( 10 ) a spherical end ( 12 ), which the clamping surfaces ( 11 ) trains. Field attachable contact ( 1 ) according to claim 1, characterized in that the contact body ( 8th ) at its one contact body end ( 8a ) a conductor opening ( 4 ) for inserting a stranded conductor into a receiving region (B) between the clamping surfaces ( 3 . 11 ) having. Field attachable contact ( 1 ) according to claim 1, characterized in that the clamping body ( 10 ) in the contact housing ( 8th ) axially movable on a thread ( 13 ) and a mounting position of the stranded conductor, wherein the distance between the clamping surfaces ( 3 . 11 ) is selected so that the stripped strands of a stranded conductor in a receiving area (B) between the clamping surfaces ( 3 . 11 ) can be screwed into a clamping position of the stranded conductor, wherein the distance between the clamping surfaces ( 3 . 11 ) is reduced from the distance in the mounting position. Field attachable contact ( 1 ) according to one of the preceding claims, characterized in that a tool holder ( 6 ) in the clamping body ( 10 ) is formed, which via a plug-side opening ( 14 ) in the contact body ( 10 ) is accessible from the outside. Field attachable contact ( 1 ) according to one of the preceding claims, characterized in that the contact body ( 8th ) has an inner wall portion (W1) having an inner radius r1, an adjoining curved wall transition portion (W2) having a changed inner radius, and a substantially annular inner wall portion (W3) having an inner radius r2, wherein the radius r2 is smaller than the radius r1. Field attachable contact ( 1 ) according to claim 5, characterized in that the bead (W) is at least partially formed by the wall transition portion (W2). Field attachable contact ( 1 ) according to claim 5 or 6, characterized in that the wall transition section (W2) is at least twice curved and preferably has a first inwardly curved course and then a curved in the opposite direction facing outward course. Field attachable contact ( 1 ) according to any one of claims 5 to 7, characterized in that the course of the inner wall along the axial direction (Z) from the inner wall section (W1) to the inner wall section (W3) according to the function y (z) can be described which one over the entire course is steadily following (z) differentiable function. Field attachable contact ( 1 ) according to one of claims 5 to 8, characterized in that adjoining the inner wall section (W3) is a further wall section (W4), which has an outwardly curved course. Field attachable contact ( 1 ) according to one of the preceding claims, characterized in that the head of the clamping body ( 10 ) is formed by more than one hemisphere, preferably by a three-quarter sphere, to which a cylindrical shank ( 17 ).

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